A179872 - OEIS

%I #6 Aug 02 2019 21:31:06

%S 3,4,6,7,8,9,12,13,14,15,16,18,19,20,21,24,25,26,27,28,30,31,32,33,35,

%T 36,37,38,39,40,42,43,44,45,48,49,50,51,52,54,56,57,60,61,62,63,64,65,

%U 66,67

%N Numbers h such that antiharmonic mean B(h) of the numbers k < h such that gcd(k, h) = 1 is not integer.

%C Numbers h such that B(h) = A053818(h) / A023896(h) = A175505(h) / A175506(h) is not integer. Numbers h such that A175506(h) > 1. Complement of A179871. a(n) = union A007645 and A179891.

%e a(6) = 9 because B(9) = A053818(9) / A023896(9) = 159/27 = 53/9 (not integer).

%Y Cf. A179871, A179873, A179874, A179875, A179876, A179877, A179878, A179879, A179880, A179882, A179883, A179884, A179885, A179886, A179887, A179890, A179891.

%K nonn

%O 1,1

%A _Jaroslav Krizek_, Jul 30 2010, Jul 31 2010